\pgfkeys{/tikz/.cd,
	vertical factor/.initial=0.5,
	vertical factor/.get=\vertfactor,
	vertical factor/.store in=\vertfactor,
	start coordinate/.initial=
		{0,\vertfactor


		}



	,
	sample line width/.initial=very thick,
	start coordinate/.initial =
		{another/. style={


					0,\vertfactor


				}


		}
	,
	sample line width/.get=\samplelinewidth,
	start coordinate/.initial=
		{0,\vertfactor
		}
		{something else
		}
	,
}
